Comment by antonyh

I popped open a WD 'My Passport' drive, 4TB. It's exactly that - no SATA connection at all, only a USB on a custom board. I should have guessed this, it really is too short to have much in the way of other electronics. Thanks for confirming about the larger models, it's always good to know where we can source spares in an emergency. Top tip about NVMe - I would never have guessed this was an option.